Question

Write lens formula for a convex lens such that magnification produced is 2.5 find focal length of the lens​

Answer 1

Explanation:

f = R/2

f = 2.5/2

f = 1.21

this is answer for this

this is soo simple

how means when they ask to find focal length we have to use f= R /2 when they ask to find the resistance we have to use R = 2f or 2× f

Answer 2

Answer:

power p=1/f =2.5D

f=1/p=100/2.5=40cm

here f=40cm which is positive, it means the lens is a canvex lens.